body{
    display: flex;
    justify-content: center;
}
body>div{
    width: 1900px;
}
*{
    margin:0 ;
}


/*----------------------------------------top----------------*/

.top{
    /*border: 1px solid red;*/
    font-size: 4px;
    color: white;
}
.top>div:nth-child(1){
    /*border: 1px solid red;*/
    display: flex;
    justify-content: space-between;
    background-color: orange;
}
.top>div:nth-child(1)>div:nth-child(1){
    margin-left: 400px;
    /*border: 1px solid red;*/
    padding: 5px;

}
.top>div:nth-child(1)>div:nth-child(2){
    margin-right :400px;;

}
.top>div>div:nth-child(2){
    display: flex;
    justify-content: space-between;

}
.top>div>div:nth-child(2)>div{
    display: flex;
    justify-content: space-between;
    padding: 5px;
}
/*--------------------------------top2-----------------------------------------*/
.top>div:nth-child(2){
    color: orange;
    display: flex;
    justify-content: space-between;

    align-items: center;
}
.top>div:nth-child(2)>div:nth-child(1){
    display: flex;
    justify-content: center;
    align-items: center;
    margin-left: 400px;
}
.top>div:nth-child(2)>div:nth-child(1)>div:nth-child(1){
    margin-top: 20px;
}
.top>div:nth-child(2)>div:nth-child(1)>div:nth-child(2)>div:nth-child(1){
    font-size: 30px;
}
.top>div:nth-child(2)>div:nth-child(1)>div:nth-child(2)>div:nth-child(2){
    color: gray;
}
/*--------------------------------导航栏-----------------------------------------*/
.nav{
    color: black;
    /*border: 1px solid red;*/
    margin-right: 500px;
    font-size: 15px;
    align-items: center;


}
.nav>div>div:nth-child(1){
    margin-right: 30px;
    color: white;
}
.nav>div>div:nth-child(2):hover{
    color: orange;
}



/*---------------------------------banner-----------------------------------*/
.banner{
    background-image: url("../img/b.jpg");
    width: 1900px;
    height: 450px;
    /*border: 1px solid red;*/
    font-size: 40px;
}
.banner>div{
    /*margin-left: 950px;*/
    padding-top: 70px;
    /*border: 1px solid red;*/
    padding-left: 950px;
}
.banner>div>div:nth-child(2){
    font-size: 20px;
    padding: 5px;
}
.banner>div>div:nth-child(3){
    font-size: 20px;
    padding: 5px 15px;
    display: flex;
    justify-content: space-between;
}
.banner>div>div:nth-child(3)>div:nth-child(1){
    margin-top: 20px;
    width: 150px;
    height: 50px;
    font-size: 20px;
    background-color:orange ;
    cursor: pointer;
    /*border-radius: 45px;*/
    text-align: center;
    align-items: center;

}
.banner>div>div:nth-child(3)>div:nth-child(2){
    /*border: 1px solid red;*/
    margin-right: 550px;
    background-color:gray ;
    cursor: pointer;
    /*border-radius: 45px;*/
    width: 150px;
    height: 50px;
    margin-top: 20px;
    text-align: center;
    align-items: center;
}